Hiflex
6 All Versions
English
2.5 - Version F
Freecooler units
Refrigerating circuit
The 8 models are provided with a single re
frigerating circuit, the units 9 have two re
frigerating circuits. The refrigerating circuit
includes the compressor and the thermal
expansion valve with an external equalizer
controlling the refrigerant flow to the evapo
rator so as to keep a steady overheating de
gree. Before the thermal expansion valve
there is a sight glass enabling the visual
check of the refrigerant charge. A dryer fil
ter is installed in the liquid line for better
cleaning and less humidity in the circuit.
On-off valves are installed as standard to
help the extraordinary maintenance of the
circuits. A suitably sized safety valve is
installed after the condenser; the valve is
equipped with flanged connections to allow
the refrigerant to be discharged outside
through suitable pipes. All low temperature
parts of the refrigerating circuit are insu
lated. The refrigerating circuit is also pro
vided with a high pressure switch and a low
pressure switch. Il pressostato di minima è
a riarmo automatico, mentre, per ragioni di sicurezza derivanti dalle possibili alte pressioni nel compres
sore, il pressostato di massima è dotato di riarmo manuale. I valori di taratura dei pressostati sono indicati
nel manuale di installazione, fornito a bordo macchina.
The low pressure switch has automatic resetting, whereas - for safety reasons due to possible high pres
sure in the compressor - the high pressure switch has manual resetting. The pressure switch calibration
values are shown in the installation manual supplied with the machine.
Condenser
The units are provided with built-in stainless steel water condensers with braze-welded plates; this ad
vanced exchanger type gives the highest efficiency in heat exchange. In addition, a certain oversizing of
the exchanger has been provided so as to reduce pressure drops (and energy consumption of the water
pump) as much as possible and thus to allow the unit to operate with the external chiller in closed circuit,
even at high outdoor temperatures. The units shall operate with water in closed circuit with external chill
er. In the operation with closed circuit, the water is cooled by the outdoor air in a heat exchanger; in this
case, to avoid unwished ice formation during winter, it is advisable to obtain the mixture always with a gly
col percentage (refer to the installation manual for the suitable percentages). The circulation of the water-
glycol mixture is forced (the pump is not supplied). To minimize water consumption and the condensing
pressure check during the different seasons of the year, the unit is provided with a water register supplied
as standard on the machine.
Hydraulic circuit
The unit is provided with a 2-way modulating valve, complete with incremental motor for the water flow
control to the freecooling coil; the opening or closing signals, generated by the electronic control, manage
the valve in order to keep the ambient temperature at the required value.
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